J10RCRA is model year 1984 according to this link...<br /> http://www.marinshopen.se/guide/omc/omc8098.htm <br />J = Johnson<br />10 = 10 horsepower<br />R = rope start<br />the exclusion of a letter here between the R and CR = 15" shaft<br />CR = 1984<br />A = model run or suffix